Low-loss TX-to-RX isolation using electrical balance duplexer with noise cancellation

A method for providing a low-loss electrical balance duplexer (EBD) with noise cancellation, the method comprising:

• coupling an EBD circuit to one or more output nodes of a transmit (TX) path, an antenna, and one or more input nodes of a receive (RX) path, and configuring the EBD circuit to isolate the TX path from the RX path, and to provide low-loss signal paths between the one or more output nodes of the TX path and the antenna;
• coupling a balancing network to the EBD circuit and configuring the EBD circuit to provide an impedance that matches an impedance associated with the antenna;
• and
• configuring a noise cancellation circuit to sense a noise signal generated by the balancing network, and to use the sensed noise signal to improve a signal-to-noise ratio (SNR) of the RX path.

An RF transceiver comprising:

• an antenna configured to transmit and receive RF signals, and
• a low-loss electrical balance duplexer (EBD) with noise cancellation comprising:
• an EBD circuit coupled to one or more output nodes of a transmit (TX) path, an antenna, and one or more input nodes of a receive (RX) path, the EBD circuit being configured to isolate the TX path from the RX path, and to provide low-loss signal paths between the one or more output nodes of the transmit (TX) path and the antenna;
• a balancing network coupled to the EBD circuit and configured to provide an impedance that matches an impedance associated with the antenna;
• and
• a noise cancellation circuit configured to sense a noise signal generated by the balancing network, and to use the sensed noise signal to improve a signal-to-noise ratio (SNR) of the RX path.